The Early Old Irish material in the newly discovered Computus Einsidlensis (c. AD 700)

The Computus Einsidlensis (Einsiedeln, Stiftsbibliothek, 321 (647), pp. 82-125) is a recently discovered text in the Swiss monastery of Einsiedeln. Besides its importance for the study of computistics in the early middle ages in general, and of seventh- and eighth-century Irish monastic learning in particular, the fact that this Latin text incorporates a considerable number of Old Irish terms makes it especially important also for the study of Old Irish. A dating to the period AD 689 to 719 is provided, together with an analysis of all the Old Irish material from this period of transition from Early to Classical Old Irish.